Prevent damage to floors by using these Hex Dumbbells with Rubber Heads and Ergo handgrips. The Ergo design helps to reduce fatigue and maximize comfort. Warning: This product contains one or more phthalate chemicals known to the state of California to cause birth defects and other reproductive harm. Consumer may return the product for a full refund, including shipping cost for both receipt and return of the product within 15 days of his or her receipt.